If you are looking to gain a lot of weight (which is what I am going for right now), I like about three-fourths of a frozen pizza after my heavy days (legs, back, chest) honestly. This is usually about 30 minutes after my post-workout shake. I have been happy with the results so far as it has been relatively easy to gain good weight. Its a tasty 900 calories mainly consisting of wheat flour, low fat cheese, and hamburger.
I have been criticized for this method in a previous thread, but I have found it great for bulking after my heavier days. I am usually ready to eat again in less than two hours so I feel like the nutrients are getting where they need to go. It's definately not the way to go for cutting, but I can still see the outline of my abs and am gaining consistently at 5'10" 210 lbs.